Figure shows the path of a light beam in an isosceles prism with apex angle `delta=60^(@)` (inside the prism beam is parallel to the base). Find the angle of deflection in degrees. The refractive index of prism material is `1.732`

Answer

`0060`

Explanation

Beam is parallel to base Rightarrow mm deviation
`mu=sin((delta+y)/2)/sin(delta/2) Rightarrow sqrt(3)=sin((60+y)/2)/sin(60/2)`
`sin((60+gamma)/2)=sqrt(3)/2 Rightarrow(60+gamma)/2=60
`gamma =60^(@)`